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Saturday, November 14, 2015

It's high impedance switch, powered by a 9V battery.
The body can act as a switch, that close the circuit, now some current flow through the base of the NPN transistor, and the transistor makes current flow through the led.

One can use a two transistor in Darlington Pair to get more gain, and makes the led bright a little more.
Thank to my friend Matteo for the vinyl cut sticker